The Peripheral Binding of 14-3-3γ to Membranes Involves Isoform-Specific Histidine Residues

Mammalian 14-3-3 protein scaffolds include seven conserved isoforms that bind numerous phosphorylated protein partners and regulate many cellular processes. Some 14-3-3-isoforms, notably γ, have elevated affinity for membranes, which might contribute to modulate the subcellular localization of the partners and substantiate the importance of investigating molecular mechanisms of membrane interaction. By applying surface plasmon resonance we here show that the binding to phospholipid bilayers is stimulated when 14-3-3γ is complexed with its partner, a peptide corresponding to the Ser19-phosphorylated N-terminal region of tyrosine hydroxylase. Moreover, membrane interaction is dependent on salts of kosmotropic ions, which also stabilize 14-3-3γ. Electrostatic analysis of available crystal structures of γ and of the non-membrane-binding ζ-isoform, complemented with molecular dynamics simulations, indicate that the electrostatic potential distribution of phosphopeptide-bound 14-3-3γ is optimal for interaction with the membrane through amphipathic helices at the N-terminal dimerization region. In addition, His158, and especially His195, both specific to 14-3-3γ and located at the convex lateral side, appeared to be pivotal for the ligand induced membrane interaction, as corroborated by site-directed mutagenesis. The participation of these histidine residues might be associated to their increased protonation upon membrane binding. Overall, these results reveal membrane-targeting motifs and give insights on mechanisms that furnish the 14-3-3γ scaffold with the capacity for tuned shuffling from soluble to membrane-bound states.This work was supported by grants from the Norwegian Cancer Society (to ØH), Junta de Andalucía, grant CVI-02483 (to JMSR), The Research Council of Norway (grant 185181 to A.M.), the Western Norway Health Authorities (grant 911618 to A.M.) and The Kristian Gerhard Jebsen Foundation (to AM)

Enzymatic Glucose Based Bio batteries: Bioenergy to Fuel Next Generation Devices

[EN] This article consists of a review of the main concepts and paradigms established in the field of biological fuel cells or biofuel cells. The aim is to provide an overview of the current panorama, basic concepts, and methodologies used in the field of enzymatic biofuel cells, as well as the applications of these bio-systems in flexible electronics and implantable or portable devices. Finally, the challenges needing to be addressed in the development of biofuel cells capable of supplying power to small size devices with applications in areas related to health and well-being or next-generation portable devices are analyzed. The aim of this study is to contribute to biofuel cell technology development; this is a multidisciplinary topic about which review articles related to different scientific areas, from Materials Science to technology applications, can be found. With this article, the authors intend to reach a wide readership in order to spread biofuel cell technology for different scientific profiles and boost new contributions and developments to overcome future challenges.Financial support from the Spanish Ministry of Science, Innovation and University, through the State Program for Talent and Employability Promotion 2013-2016 by means of Torres Quevedo research contract in the framework of Bio2 project (PTQ-14-07145) and from the Instituto Valenciano de Competitividad Empresarial-IVACE-GVA (BioSensCell project)Buaki-Sogo, M.; García-Carmona, L.; Gil Agustí, MT.; Zubizarreta Saenz De Zaitegui, L.; García Pellicer, M.; Quijano-Lopez, A. (2020). Enzymatic Glucose Based Bio batteries: Bioenergy to Fuel Next Generation Devices. Topics in Current Chemistry (Online). 378(6):1-28. https://doi.org/10.1007/s41061-020-00312-8S1283786Schlögl R (2015) The revolution continues: Energiewende 2.0. Angew Chem Int Ed 54:4436–4439Mitcheson PD, Yeatman EM, Rao GK, Holmes AS, Green TC (2008) Energy harvesting from human and machine motion for wireless electronic devices. Proc IEEE 96(9):1457–1486Wang ZL, Wu W (2012) Nanotechnology-enabled energy harvesting for self-powered micro-/nanosystems. Angew Chem Int Ed 51:11700-11721Lamy C, Lima A, LeRhun V, Delime F, Coutanceau C, Léger J-M (2002) Recent advances in the development of direct alcohol fuel cells (DAFC). J Power Sources 105:283Cheng X, Shi Z, Glass N, Zhang L, Zhang J, Song D, Liu Z-S, Wang H, Shen J (2007) A review of PEM hydrogen fuel cell contamination: impacts, mechanisms, and mitigation. J Power Sources 165:739Boudghere Stambouli A, Traversa E (2002) Solid oxide fuel cells (SOFC): a review of an environmentally clean and efficient source of energy. Renew Sustain Energy Rev 6:433–455Qiao Y, Li CM (2011) Nanostructured catalyst in fuel cells. J Mater Chem 21:4027–4036Edwards PP, Kuznetsov VL, David WIF, Brandon NP (2008) Hydrogen and fuel cells: towards sustainable energy future. Energy Policy 36:4356–4362Kirubakaran A, Jain S, Nema RK (2009) A review on fuel cell technologies and power electronic interface. Renew Sustain Energy 13:2430–2440Kerzenmacher S, Ducree J, Zengerle R, von Stetten F (2008) An abiotically catalyzed glucose fuel cell for powering medical implants: reconstructed manufacturing protocol and analysis of performance. J Power Sources 182:66–75Drake RF, Kusserow BK, Messinger S, Matsuda S (1970) A tissue implantable fuel cell power supply. Trans Am Soc Artif Intern Organs 16:199–205Giner J, Holleck G, Malachesky PA (1973) Eine implantierbare Brennstoffzelle zum Betrieb eines mechanischen Herzens. Phys Chem 77:782–783. https://doi.org/10.1002/bbpc.19730771009Cosnier S, LeGoff A, Holzinger M (2014) Towards glucose biofuel cells implanted in human body for powering artificial organs: review. Electrochem Commun 38:19–23Katz E (2015) Implantable biofuel cells operating in vivo—potential power sources for bioelectronic devices. Bioelectron Med 2:1–12Bullen RA, Arnot TC, Lakeman JB, Walsh FC (2006a) Biofuel cells and their development . Biosens Bioelectron 21:2015–2045Cooney MJ, Svoboda V, Lau C, Martin G, Minteer SD (2008) Enzyme catalysed biofuel cells. Energy Environ Sci 1:320–337Cracknell JA, Vincent KA, Armstrong FA (2008) Enzymes as working or inspirational electrocatalysts for fuel cells and electrolysis. Chem Rev 108:2439–2461Sheldon RA (2007) Enzyme immobilization: the quest for optimum performance. Adv Synth Catal 349:1289–1307Bullen RA, Arnot TC, Lakeman JB, Walsh FC (2006b) Biofuel cells and their development. Biosens Bioelectron 21:2015–2045Koch C, Popiel D, Harnisch F (2014) Functional redundancy of microbial anodes fed by domestic wastewater. ChemElectroChem 1:1923–1931Mano N, Mao F, Heller A (2003) Characteristics of a miniature compartment-less glucose−O2 biofuel cell and its operation in a living plant. J Am Chem Soc 125(21):6588–6594Mano N, Mao F, Heller A (2002) A miniature biofuel cell operating in a physiological buffer. J Am Chem Soc 124(44):12962–12963Bruen D, Delaney C, Florea L, Diamond D (2017) Glucose sensing for diabetes monitoring: recent developments. Sensors 17:1866Falk M, Blum Z, Shleev S (2012) Direct electron transfer based enzymatic fuel cells. Electrochim Acta 82:191–202White HB (1976) Coenzymes as fossils of an earlier metabolic state. J Mol Evol 7:101–104Broderick JB (2001) Coenzymes and cofactors. In: eLS. Wiley, Chichester. https://www.els.net. https://doi.org/10.1038/npg.els.0000631Sakurai T, Kataoka K (2007) Basic and applied features of multicopper oxidases, CueO, bilirubin oxidase, and laccase. Chem Rec 7:220–229Bankar SB, Bule MV, Singhal RS, Ananthanarayan L (2009) Glucose oxidase—an overview. Biotech Adv 27:489–501Ferri S, Kojima K, Sode K (2011) Review of glucose oxidases and glucose dehydrogenases: a bird’s eye view of glucose sensing enzymes. J Diabetes Sci Technol 5:1068–1076Katz E, MacVittie K (2013) Implanted biofuel cells operating in vivo—methods, applications and perspectives—feature article. Energy Environ Sci 6:2791–2803Ghindilis AL, Atanasov P, Wilkins E (1997) Enzyme catalysed direct electron transfer: fundamentals and analytical applications. Electroanalysis 9:661–674Von Woedtke Th, Fisher U, Abel P (1994) Glucose oxidase electrodes: effect of H2O2 on enzyme activity? Biosens Bioelectron 9:65–71Kleppe K (1966) The effect of H2O2 on glucose oxidase from Aspergillus niger. Biochemistry 5:139–143Zebda A, Godran C, Le Goff A, Holzinger M, Cinquin P, Cosnier S (2011) Mediatorless high-power glucose biofuel cells based on compressed carbon nanotube-enzyme electrodes. Nat Commun 2:370Borenstein A, Hanna O, Attias R, Luski S, Brousse T, Aurbach D (2017) Carbon-based composite materials for supercapacitor electrodes: a review. J Mater Chem A 5:12653–12672Angione MD, Pilolli R, Cotrone S, Magliulo M, Mallardi A, Palazzo G, Sabbatini L, Fine D, Dodabalapur A, Lioffi N, Torsi L (2011) Carbon based nanomaterials for electronic bio-sensing. Mat Today 14:424–433Cha C, Shin SR, Annabi N, Dokmeci MR, Khademhosseini A (2013) Carbon based nanomaterials: multifunctional materials for biomedical engineering. ACS Nano 7:2891–2897Wang Z, Dai Z (2015) Carbon nanomaterials-based electrochemical biosensors: an overview. Nanoscale 7:6420–6431Jariwala D, Sangwan VK, Lauhon LJ, Marks TJ, Hersam MC (2013) Carbon nanomaterials for electronics, optoelectronics, photovoltaics and sensing. Chem Soc Rev 42:2824–2860Babadi AA, Bagheri S, Abdul Hamid SB (2016) Progress on implantable biofuel cell: nano-carbon functionalization for enzyme immobilization enhancement. Biosens Bioelectron 15:850–860Osadebe I, Leech D (2014) Effect of multi-walled carbon nanotubes on glucose oxidation by glucose oxidase or a flavin-dependent glucose dehydrogenase in redox-polymer-mediated enzymatic fuel cell anodes. ChemElectroChem 1:1988–1993Si P, Huang Y, Wang T, Ma J (2013) Nanomaterials for electrochemical non-enzymatic glucose biosensors. RSC Adv 3:3487–3502Putzbach W, Ronkainen NJ (2013) Immobilization techniques in the fabrication of nanomaterial-based electrochemical biosensors: a review. Sensors 13(4):4811–4840Walcarius A, Minteer SD, Wang J, Lin Y, Merkoçi A (2013) Nanomaterials for bio-functionalized electrodes: recent trends. J Mater Chem B 1:4878–4908Datta S, Christena LR, Rajaram YRS (2013) Enzyme immobilization: an overview on techniques and support materials. 3 Biotech 3(1):1–9Ivanov I, Vidaković-Koch T, Sundmaker K (2010) Recent advances in enzymatic fuel cells; experiments and modelling. Energies 3:803–846Nguyen HH, Kim M (2017) An overview of techniques in enzyme immobilization. Appl Sci Converg Technol 26(6):157–163Fu J, Reinhold J, Woodbury NW (2011) Peptide-modified surfaces for enzyme immobilization. PLoS One 6(4):e18692Lee DH, Park CH, Yeo JM, Kim SW (2006) Lipase immobilization on silica gel using a cross-linking method. J Ind Eng Chem 12(5):777–782Szymańska K, Bryjak J, Jarzębski AB (2009) Immobilization of invertase on mesoporous silicas to obtain hyper active biocatalysts. Top Catal 52:1030–1036Al-Lolage F, Meneghello M, Ma S, Ludwig R, Barlett PN (2017) A flexible method for the stable, covalent immobilization of enzymes at electrode surfaces. ChemElectroChem 4:1528–1534Gutierrez-Sanchez C, Shleev S, De Lacey AL, Pita M (2015) Third-generation oxygen amperometric biosensor based on Trametes hirsuta laccase covalently bound to graphite electrode. Chem Pap 69:237–240Pita M, Gutierrez-Sanchez C, Toscano MD, Shleev S, De Lacey AL (2013) Oxygen biosensor based on bilirubin oxidase immobilized on a nanostructured gold electrode. Bioelectrochemistry 94:69–74Vaz-Dominguez C, Campuzano S, Rüdiger O, Pita M, Gorbacheva M, Shleev S, Fernandez VM, de Lacey LA (2008) Laccase electrode for direct electrocatalytic reduction of O2 to H2O with high-operational stability and resistance to chloride inhibition. Biosens Bioelectron 24(4):531–537Gutiérrez-Sánchez C, Jia W, Beyl Y, Pita M, Schuhmann W, de Lacey LA, Stoica L (2012) Enhanced direct electron transfer between laccase and hierarchical carbon microfibers/carbon nanotubes composite electrodes. Comparison of three enzyme immobilization methods. Electrochim Acta 82:218–223Lv Y, Jin S, Wang Y, Lun Z, Xia C (2016) Recent advances in the application of nanomaterials in enzymatic glucose sensors. J Iran Chem Soc 13(10):1767–1776Zhao C, Gai P, Song R, Chen Y, Zhang J, Zhu J-J (2017) Nanostructured material-based biofuel cells: recent advances and future prospects. Chem Soc Rev 46:1545–1564Yu EH, Scott K (2010) Enzymatic biofuel cells—fabrication of enzyme electrodes. Energies 3:23–42Minteer SD, Atanassov P, Luckarift HR, Johnson GR (2013) New materials for biological fuel cells. Mater Today 15(4):166–173Sarma AK, Vatsyayan P, Goswami P, Minteer SD (2009) Recent advances in material science for developing enzyme electrodes. Biosens Bioelectron 24:2313–2322Jesionowski T, Zdarta J, Krajewska B (2014) Enzyme immobilization by adsorption: a review. Adsorption 20:801–821Sardar M, Gupta MN (2005) Immobilization of tomato pectinase on Con A-Seralose 4B by bioaffinity layering. Enzyme Microbial Technol 37:355–359Sheldon RA (2011) Characteristic features and biotechnological applications of cross-linked enzyme aggregates (CLEAs). Appl Microbiol Biotechnol 92:467–477Velasco-Lozano S, López-Gallego F, Mateos-Díaz JC, Favela-Torres E (2015) Cross-linked enzyme aggregates (CLEA) in enzyme improvement—a review. Biocatalysis 1:166–177Cosnier S (1999) Biomolecule immobilization on electrode surfaces by entrapment or attachment to electrochemically polymerized films. A review. Biosen Bioelectron 14:443–456Heller A (1990) Electrical wiring of redox enzymes. Acc Chem Res 29:128–134Heller A (1992) Electrical connection of enzyme redox centres to electrodes. J Phys Chem 96:3579–3587Martins MVA, Pereira AR, Luz RAS, Iost RM, Crespilho FN (2014) Evidence of short-range electron transfer of a redox enzyme on graphene oxide electrodes. Phys Chem Chem Phys 16:17426–17436Luz RAS, Pereira AR, de Souza JCP, Sales FCPF, Crespilho FN (2014) Enzyme biofuel cells: thermodynamics. Kinetics and challenges in applicability. ChemElectroChem 1(11):1751–1777Neto SA, De Andrade AR (2013) New energy sources: the enzymatic biofuel cell. J Braz Chem Soc 24(12):1891–1912Rapoport BI, Kedzierski JT, Sarpeshkar R (2012) A glucose fuel cell for implantable brain–machine interfaces. PLoS One 7(6):6 e38436Zebda A, Alcaraz J-P, Vadgama P, Shleev S, Minteer SD, Boucher F, Cinquin P, Martin DK (2018) Challenges for successful implantation of biofuel cells. Bioelectrochemistry 124:57–72Ferraris RP, Diamond J (1997) Regulation of intestinal sugar transport. Physiol Rev 77:257–301Sprague JE, Arbeláez AM (2011) Glucose counterregulatory responses to hypoglicemia. Pediatr Endocrinol Rev 9:463–475Slaughter G, Kulkarni T (2019) Detection of human plasma glucose using a self-powered glucose biosensor. Energies 12:825Rathee K, Dhull V, Dhull R, Singh S (2016) Biosensors based on electrochemical lactate detection: a comprehensive review. Biochem Biophys Rep 5:35–54Koushanpour A, Gamella M, Katz E (2017) A biofuel cell based on biocatalytic reactions of lactate on both anode and cathode electrodes—extracting electrical power from human sweat. Electroanalysis 29:1602–1611Yao Y, Li H, Wang D, Liu C, Zhang C (2017) An electrochemiluminescence cloth-based biosensor with smartphone-based imaging for detection of lactate in saliva. Analyst 142:3715–3724Pankratov D, González-Arribas E, Blum Z, Shleev S (2016) Tear based bioelectronics. Electroanalysis 28:1250–1266Krogstad AL, Jansson PA, Gisslen P, Lönnroth P (1996) Microdialysis methodology for the measurement of dermal interstitial fluid in humans. Br J Dermatol 134(6):1005–1012Bandodkar AJ, Wang J (2016) Wearable biofuel cells: a review. Electroanalysis 28:1188–1200Jia W, Valdés-Ramírez G, Bandodkar AJ, Windmiller JR, Wang J (2013) Epidermal biofuel cells: energy harvesting from human perspiration. Angew Chem Int Ed 52:1–5Jeerapan I, Sempionatto JR, Pavinatto A, You J-M, Wang J (2016) Stretchable biofuel cells as wearable textile-based self-powered sensors. J Mater Chem A 4:18342–18353Valdés-Ramírez G, Li Y-G, Kima J, Jia W, Bandodkar AJ, Nuñez-Flores R, Miller PR, Wu S-Y, Narayan R, Windmiller JR, Polsky R, Wang J (2016) Microneedle-based self-powered glucose sensor. Electrochem Commun 47:58–62Gamella M, Koushanpour A, Katz E (2018) Biofuel cells—activation of micro- and macro- electronic devices. Bioelectrochemistry 119:33–42Mano N, Mao F, Shin W, Chen T, Heller A (2003) A miniature biofuel cell operating at 0.78 V. Chem Commun 20:518–519Shi B, Li Z, Fan Y (2018) Implantable energy harvesting devices. Adv Mater 30:1801511MacVittie K, Halámek J, Halámková L, Southcott M, Jemison WD, Lobel R, Katz E (2013) From “cyborg” lobsters to a pacemaker powered by implantable biofuel cells. Energy Environ Sci 6:81–86Szczupak A, Halámek J, Halámková L, Bocharova V, Alfonta L, Katz E (2012) Living battery—biofuel cells operating in vivo in clams. Energy Environ Sci 5:8891–8895Southcott M, MacVittie K, Halámek J, Halámková L, Jemison WD, Lobel R, Katz E (2013) A pacemaker powered by an implantable biofuel cell operating under conditions mimicking the human blood circulatory system—battery not included. Phys Chem Chem Phys 15:6278–6283MacVittie K, Conlon T, Katz E (2015) A wireless transmission system powered by an enzyme biofuel cell implanted in an orange. Bioelectrochemistry 106:28–33Aghahosseini H, Ramazani A, Asiabi PA, Gouranlou F, Hosseini F, Rezaei A, Min B-K, Joo SW (2016) Glucose-based biofuel cells: nanotechnology as a vital science in biofuel cell performance. Nanochem Res 1(2):83–204Zebda A, Cosnier S, Alcaraz J-P, Holzinger M, Le Goff A, Gondran C, Boucher F, Giroud F, Gorgy K, Lamraoui H, Cinquin P (2013) Single glucose biofuel cells implanted in rats power electronic devices. Sci Rep 2013:1516Ichi-Ribault SE, Alcaraz J-P, Boucher F, Boutaud B, Dalmolin R, Boutonnat J, Cinquin P, Zebda A, Martin DK (2018) Remote wireless control of an enzymatic biofuel cell implanted in a rabbit for 2 months. Electrochim Acta 269:360–366Bandodkar A (2017) Review—wearable biofuel cells: past, present and future. J Electrochem Soc 164(3):H3007–H3014Coman V, Ludwig R, Harreither W, Haltrich D, Gorton L, Ruzgas T, Shleev S (2010) A direct electron transfer-based glucose/oxygen biofuel cell operating in human serum. Fuel Cells 10(1):9–16Shoji K, Akiyama Y, Suzuki M, Nakamura N, Ohno H, Morishima K (2016) Biofuel cell backpacked insect and its application to wireless sensing. Biosens Bioelectron 78:390–395Reuillard B, Abreu C, Lalaoui N, Le Goff A, Holzinger M, Ondel O, Buret F, Cosnier S (2015) One-year stability for a glucose/oxygen biofuel cell combined with pH reactivation of the laccase/carbon nanotube biocathode. Bioelectrochemistry 106:73–76Sales FCPF, Iost RM, Martins MVA, Almeida MC, Crespilho FN (2013) An intravenous implantable glucose/dioxygen biofuel cell with modified flexible carbon fiber electrodes. Lab Chip 13:468Falk M, Narvez Villarrubia CW, Babanova S, Atanassov P, Shleev S (2013) Biofuel cells for biomedical applications: colonizing the animal kingdom. ChemPhysChem 14:2045–2058Rasmussen M, Ritzmann RE, Lee I, Pollack AJ, Scherson D (2012) An implantable biofuel cell for a live insect. J Am Chem Soc 134(3):1458–1460Halámková L, Halámek J, Bocharova V, Szczupak A, Alfonta L, Katz E (2012) Implanted biofuel cell operating in a living snail. J Am Chem Soc 134:5040–5043Cinquin P, Gondran C, Giroud F, Mazabrard S, Pellisier A, Boucher F, Alcaraz J-P, Gorgy K, Lenouvel F, Mathé S, Porcu P, Cosnier S (2010) A glucose biofuel cell implanted in rats. Plos One 5(5):e010476Chen C, Xie Q, Yang D, Xiao H, Fu Y, Tan S, Yao S (2013) Recent advances in electrochemical glucose biosensors: a review. RSC Adv 3:4473–4491Andoralov V, Falk M, Suyatin DB, Granmo M, Sotres J, Ludwig R, Popov VO, Schouenborg J, Blum Z, Shleev S (2013) Biofuel cell based on microscale nanostructured electrodes with inductive coupling to rat brain neuronsVerbeek MM, Leen WG, Willemsen MA, Slats D, Claassen JA (2016) Hourly analysis of cerebrospinal fluid glucose shows large diurnal fluctuations. J Cereb Blood F Met 36(5):899–902González-Guerrero MJ, Del Campo FJ, Esquivel JP, Leech D, Sabaté N (2017) Paper-based microfluidic biofuel cell operating under glucose concentrations within physiological range. Biosens Bioelectron 90:475–480Takeuchi ES, Leising RA (2002) Lithium batteries for biomedical applications. MRS Bull 27(8):624–627Bock DC, Marschilok A, Takeuchi KJ, Takeuchi ES (2012) Batteries used to power implantable biomedical devices. Electrochim Acta 84:155–164Greatbatch W, Lee JH, Mathias W, Eldridge M, Moser JR, Schneider AA (1971) The solid-state lithium battery: a new improved chemical power source for implantable cardiac pacemaker. IEEE Trans Biomed Eng 18(5):317–324Liu Y, Dong S (2007) A biofuel cell with enhanced power output by grape juice. Electrochem Commun 9(7):1423–1427Choi S, Lee H, Ghaffari R, Hyeon T, Kim D-H (2016) Recent advances in flexible and stretchable bio-electronic devices integrated with nanomaterials. Adv Mater 28:4203–4218Zhou L, Mao J, Ren Y, Han ST, Roy VAL, Zhou Y (2018) Recent advances of flexible data storage devices based on organic nanoscale materials. Small 14(10):1703126Gwon H, Kim H-S, Lee KU, Seo D-H, Park YC, Lee Y-S, Ahn BT, Kong K (2011) Flexible energy storage devices based on graphene paper. Energy Environ Sci 4:1277–1283Pang C, Lee C, Suh K-Y (2013) Recent advances in flexible sensors for wearable and implantable devices. J Appl Pol Sci 130:1429–1441Bandodkar AJ, Wang J (2014) Non-invasive wearable electrochemical sensors: a review. Trends Biotech 32(7):363–371Bandodkar AJ, Uia W, Wang J (2015) Tatto-based wearable electrochemical devices: a review. Electroanalysis 27(3):562–572Reid RC, Minteer SD, Gale BK (2015) Contact lens biofuel cell tested in a synthetic tear solution. Biosens Bioelectron 68:142Falk M, Andoralov V, Blum Z, Sotres J, Suyatin DM, Ruzgas T, Arnebrant T, Shleev S (2012) Biofuel cells as a power source for electronic contact lenses. Biosens Bioelectron 37(1):38–45Falk M, Andoralov V, Silow M, Toscano MD, Shleev S (2013) Miniature biofuel cell as a potential power source for Glucose-sensing contact lenses. Anal Chem 85(13):6342–6348Reid R, Jones SR, Hickey DP, Minteer SD, Gale BK (2016) Modeling carbon nanotubes connectivity and surface activity in a contact lens biofuel cell. Electrochim Acta 203:30–40Blum Z, Pankratov D, Shleev S (2014) Powering electronic contact lenses: current achievements, challenges and perspective. Expert Rev Ophthalmol 9(4):269–273Xiao X, Siepenkoetter T, Conghaile PÓ, Leech D, Magner E (2018) Nanoporous gold-based biofuel cell on contact lenses. ACS Appl Mater Interfaces 10(8):7107–7116Yang X-Y, Tian G, Jiang N, Su B-L (2012) Immobilization technology: a sustainable solution for biofuel cell design. Ener Environ Sci 5:5540–5563Mano N (2019) Engineering glucose oxidase for bioelectrochemical applications. Bioelectrochemistry 128:218–240Mate DM, Gonzalez-Perez D, Falk M, Kittl R, Pita M, De Lacey LA, Ludwig R, Shleev S, Alcalde M (2013) Blood tolerant caccase by directed evolution. Chem Biol 20:223–231Zhang L, Carucci C, Reculusa S, Goudeau B, Lefrançois P, Gounel S, Mano N, Kuhn A (2019) Rational design of enzyme-modified electrodes for optimized bioelectrocatalytic activity. ChemElectroChem 6(19):4980–4984Arechederra MN, Addo PK, Minteer SD (2011) Poly(neutral red) as a NAD+ reduction catalyst and a NADH oxidation catalyst: towards the development of a rechargeable biobattery. Electrochim Acta 56:1585Yang Y, Wang ZL (2015) Hybrid energy cells for simultaneously harvesting multi-types of energies. NanoEnergy 14:245–256Hansen BJ, Liu Y, Yang R, Wang ZL (2010) Hybrid nanogenerator for concurrently harvesting biomechanical and biochemical energy. ACS Nano 4:3647Song K, Han JH,

Large expert-curated database for benchmarking document similarity detection in biomedical literature search

Document recommendation systems for locating relevant literature have mostly relied on methods developed a decade ago. This is largely due to the lack of a large offline gold-standard benchmark of relevant documents that cover a variety of research fields such that newly developed literature search techniques can be compared, improved and translated into practice. To overcome this bottleneck, we have established the RElevant LIterature SearcH consortium consisting of more than 1500 scientists from 84 countries, who have collectively annotated the relevance of over 180 000 PubMed-listed articles with regard to their respective seed (input) article/s. The majority of annotations were contributed by highly experienced, original authors of the seed articles. The collected data cover 76% of all unique PubMed Medical Subject Headings descriptors. No systematic biases were observed across different experience levels, research fields or time spent on annotations. More importantly, annotations of the same document pairs contributed by different scientists were highly concordant. We further show that the three representative baseline methods used to generate recommended articles for evaluation (Okapi Best Matching 25, Term Frequency–Inverse Document Frequency and PubMed Related Articles) had similar overall performances. Additionally, we found that these methods each tend to produce distinct collections of recommended articles, suggesting that a hybrid method may be required to completely capture all relevant articles. The established database server located at https://relishdb.ict.griffith.edu.au is freely available for the downloading of annotation data and the blind testing of new methods. We expect that this benchmark will be useful for stimulating the development of new powerful techniques for title and title/abstract-based search engines for relevant articles in biomedical research

Reactivity of He with ionic compounds under high pressure

Helium was long thought to be unable to form stable solid compounds, until a recent discovery that helium reacts with sodium at high pressure. Here, the authors demonstrate the driving force for helium reactivity, showing that it can form new compounds under pressure without forming any local chemical bonds

Siidraite, Pb 2 Cu(OH) 2 I 3 , from Broken Hill, New South Wales, Australia: the third halocuprate(I) mineral

Siidraite, Pb2Cu(OH)2I3, is a new mineral from the Broken Hill deposit in New South Wales, Australia. It occurs as an extremely rare secondary phase alongside marshite, other lead and copper secondaries and supergene cuprite on a single specimen, BM 84642 preserved in the collection of the Natural History Museum, London. Siidraite is yellow and occurs in crystalline grainy aggregates up to 0.3 mm around relict galena. The mineral is translucent with a vitreous lustre and yellow streak, no cleavages or forms have yet been observed. It is non-fluorescent in mixed-wavelength UV light. The calculated density is 6.505 g cm−3. Siidraite is orthorhombic, space group Fddd, a = 16.7082(9) Å, b = 20.846(1) Å, c = 21.016(1) Å, V = 7320.0(8) Å3 and Z = 32. The empirical formula derived from a combination of electron-microprobe analysis and structure determination is Pb2.06Cu0.89(OH)2I2.97, the ideal formula has (in wt%) 8.01 Cu2O, 50.01 PbO, 42.65 I and 2.02 H2O. The five strongest lines in the calculated X-ray powder diffraction pattern are [(h k l), d obs (Å), I/I max (%)]: [(2 4 6), 2.746, 100], [(4 0 4), 3.270, 81], [(2 6 4), 2.738, 77], [(3 1 5), 3.312, 76], [(3 5 1), 3.296, 69]. The crystal used for structure determination had minor pseudomerohedral twinning on [ 0   1 ‾   1 ] and the structure was refined taking this into account to R 1 = 0.037, wR 2 = 0.052, GooF = 1.016, based upon 1368 unique reflections having I > 2σ(I). The structure of siidraite is a framework comprising an alternation of two structural elements, a cubane-like [Pb4(OH)4]4+ group and a [Cu2I6]4− dimer of edge-sharing CuI4 tetrahedra with non-equivalent Cu. Six halocuprate groups surround each [Pb4(OH)4]4+ nucleus, and each halocuprate group is shared between six adjacent [Pb4(OH)4]4+ groups, five long Pb–I bonds are required to complete the co-ordination of each Pb atom. The resulting Pb(OH)3I5 polyhedra are centred on a tetrahedron of O atoms to form a Pb4(OH)4I16 cluster. Siidraite has a unique composition and structure. It is the third naturally occurring halocuprate(I) after marshite and nantokite. A compositionally similar synthetic compound Pb2Cu2(OH)2I2Br has been described that has cubane and CuI4 groups, but a very different structural topology from that of siidraite. Bideauxite, Pb2Ag(OH)FCl3, which has the [Pb4(OH)4]4+ group, shares some topological features with siidraite.This article is available on open access repositories published under a Creative Commons BY-NC-ND license: https://creativecommons.org/licenses/by-nc-nd/3.0/. The attached file is the published version of the article

Raman spectroscopic study of hydrous wadsleyite (beta-Mg2SiO4) to 50 GPa

Raman spectra of hydrous β-Mg2SiO4 (1.65 wt% H2O) have been measured in a diamond-anvil cell with helium as a pressure-transmitting medium at room temperature to 50 GPa. We observe three OH-stretching modes, a doublet with components at 3329 and 3373 cm-1, which decrease linearly with pressure, and a single mode at 3586 cm-1, which remains nearly constant up to 24 GPa before decreasing at higher pressures. Assessment of the mode frequencies and their pressure dependence, together with previous results from X-ray and IR data, are consistent with protonation of the O1 site in agreement with previous studies. Strict assignment of Raman activity awaits detailed structural models. The nature of the protonation in wadsleyite may require more specific experimental probes for full solution of the hydrogen-site problem